Training plan: how to reschedule a workout in the current week.

Sometime, for personal convenience I would like to reschedule a session from one day to another.  Calendar tool doesn't autorise that using drag & drop (Edge / Chrome or android).

Please note that the same if the session was already passed or not. YOU CANNOT ORDER WORKOUT AS YOU PREFER !!! Make Garmin coach unusable !

It's a real problem if the tool cannot grant minimum of flexibility. I'm not a pro and I have some challenge outside sport !